When you launch Terraria, the Xbox 360 dashboard will perform a "License Check" and then a "Update Check."
To understand the download process, one must understand the architecture of the Xbox 360. Unlike modern "Games as a Service" models where games update seamlessly in the background via constant internet connectivity, the Xbox 360 utilized a system of "Title Updates" (TUs).
Do not trust "Terraria TU14 Download" links on YouTube descriptions or ad-filled forums. These are often viruses or dead links. The official Xbox Live cache method is the only safe way for a standard console.
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